following instructions

Instructions:In order for this to work, you will need to do (A).

User: Help, I need my application to work!Me: Have you followed the instructions?User: Yes, I’ve done (B) and (C).Me: Have you followed the instructions and done (A)?User: Yes, I’ve now done (B) and (C) twice and it’s still not working. I’ll try (D) next.Me: You just need to do (A).User: (D) didn’t work, you’re wasting my time.Me: Can we go back to the initial instructions, please. Read them carefully and follow all the steps detailed there.User: I’ve asked around and I’ve been told to do (D) again, and then follow it up with (X), (Y), and (Z). Twice.Me: Perhaps you could try (A)?User: (D), (X), (Y) and (Z) didn’t work. You know nothing.